Holographic figure sensor

Details Holographic figure sensor Holographic figure sensor

1982-11-18

1985-08-20

Willis, Davis L.

Optics: measuring and testing

By particle light scattering

With photocell detection

356360, G01B 9021

Patent

active

045360863

ABSTRACT:
Methods and means are provided for making measurements of the optical figure of a remote thin deformable mirror (16). Relatively small holographic elements (24) are formed on portions of the mirror (16). A laser beam is transmitted to illuminate the elements (22). Diffracted laser beam signals from the elements (22) are used to produce a hologram or corrector plate (34) which is subsequently used to produce reference signals representative of the original shape of the mirror. When the holographic elements (22) of the mirror are subsequently illuminated by a laser beam, the diffracted signals reconstruct the reference signals recorded or stored on the corrector plate (34). The output signal represents the deviations of the mirror from its original shape.

REFERENCES:
patent: 3860346 (1975-01-01), Kersch et al.
patent: 4239392 (1980-12-01), Pohle
Erickson, "Investigation-Monitoring and Control of Large Telescope Performance", NASA CR-111811, Accession No. N71-19019, CNT157, Sep. 1970.

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